usr.sbin/xntpd/lib/netof.c


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/* 
 * netof - return the net address part of an ip address
 *         (zero out host part)
 */
#include <stdio.h>

#include "ntp_fp.h"
#include "ntp_stdlib.h"

u_long
netof(num)
	u_long num;
{
	register u_long netnum;

	netnum = num;
	if(IN_CLASSC(netnum))
		netnum &= IN_CLASSC_NET;
	else if (IN_CLASSB(netnum))
		netnum &= IN_CLASSB_NET;
	else			/* treat all other like class A */
		netnum &= IN_CLASSA_NET;
	return netnum;
}